Questions Asked on
September 29, 2013

delftx
We are going to build a PV system on a roof of 10m2, and we have two possible PV modules: (1) A first generation module with efficiency η=17% and cost of 0.80€/Wp. (2) A second generation PV module with efficiency η=10% and cost of 0.40€/Wp. The
asked by Anonymous 
Chemistry Please help
A bottle of 12.0 M hydrochloric acid has only 35.7 mL left in it. What will the HCl concentration be if the solution is diluted to 250.0 mL?
asked by Alexandra 
Probability and Statistics
An oil prospector will drill a succession of holes in a given area to find a productive well. The probability that he is successful on a given trial is 0.2. a) What's the probability that that the third hole drilled is the first to yield a productive well?
asked by Katy 
chem
How many moles of carbon are needed to react with 525 g of hematite 2FeO3+6C>4Fe+3Co2 idk how to convert moles of fe2o3 to carbon
asked by Julie 
AP Chemistry
Consider the reaction 2 Al2O3(s) ! 4 Al(s) + 3 O2(g) . H = +3339.6 kJ/mol What is the change in heat when 0.455 L of a 3.60 M Al solution reacts with excess O2 ? 1. 424 kJ 2. 2735 kJ 3. 1695 kJ 4. 1368 kJ 5. 26,521 kJ 6. 21,962 kJ 7. 685 kJ 8.
asked by Anonymous 
chem
The reaction: 2C2H2+5O2>5O2>4CO2+2H2O is performed by mixing 175 grams of C2H2 and 175 grams of O2 to produce 127 grams of CO2 1)Limiting reagent 2)Theretical yeield of CO2 3)Percent yield of CO2
asked by Alexandra 
Probability and Statistics (Continuation)
Assume 10% of the engines manufactured on an assembly line are defective. If engines are randomly selected one at a time and tested. What is the probability that the third nondefective engine will be found a)on the fifth trial? b) on or before the fifth
asked by Katy 
offfice finaces
Using your computer software, you create a new file for an existing customer. When you're finished, you should A. coordinate the old and new files by giving both the same name. B. overwrite the existing file by giving the new file the same name. C. allow
asked by Sofiya 
Statistics
1. A human gene carries a certain disease from a mother to her child with a probability rate of 0.58. That is, there is a 58% chance that the child becomes infected with the disease. Suppose a female carrier of the gene has five children. Assume that the
asked by Lisa 
Geometry
A regular pentagonal solid prism has 9cm base edges. A larger, similar solid prism of the same material has 36cm base edges. How does each indicated measurement for the larger prism compare to the same measurement for the smaller prism? Find the volume and
asked by George 
Physics
Problem 3 If a bug can jump straight up to a height of 0.5 m. a) what is its initial speed as it leaves the ground? b) How long is it in the air?
asked by Maryam 
physics
A car sits in an entrance ramp to a freeway, waiting for a break in the traffic. The driver sees a small gap between a van and an 18wheel truck and accelerates with constant acceleration along the ramp and onto the freeway. The car starts from rest, moves
asked by Emma 
chem
write the correct net ionic equation and identify spectator ions when CoSO4 and BaCL2 mix
asked by Alexandra 
Grade 12 physics
At the beach, 3 children pull on a floating toy. Child 1 plus with a force of 15N [N 24°E], child 2 pulls south and child 3 pulls west. The net force of the toy is zero. Assume that there are no other significant forces acting on the toy. a) Calculate the
asked by keisha 
Science/Math
Word Problems pages 1819 A sailboat heads north at 3 m/s for 1 hour and then tracks back to the southeast (at 45 degrees to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location? The textbook that
asked by Walter 
Math
Ms. Santiago has many pens in her desk drawer. She says that if you divide the total number of pens by 1, 2, 3, 4, 5, or 6, you get a remainder of 1. What is the least number of pens that could be in ms. Santiago's drawer,
asked by Shohanur 
Chemistry
What is the compound formula for Cation: Na+ and Anion: CN
asked by Sabrina 
maths
Find the mean, variance and standard deviation for the following data 6, 12, 6, 8, 10, 8, 12, 8, 14, 16
asked by partha 
PHYSICS
A rod 14.0 cm long is uniformly charged and has a total charge of 20.0 µC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 36.0 cm from its center. N/C
asked by physics 
Chemistry
How long would it take for 2.2 x 10^4 mol H2 to effuse through the same orifice as the 2.2x 10^4 mol N2? (It takes 105s for N2 to effuse) I was thinking of setting up the equation like: sqroot(28.014gN2/mol / 2.016g H2/mol) = 3.728 What should I do next?
asked by Nikki 
help!!!!!!!! Physics
A microbiologist measures the speed of a swimming bacterium. The bacterium covers a distance of 2.16 microns in 5.0 seconds. The biologist wished to compare the speed of the bacteria with other animals, but the speeds of other animals are listed in
asked by Mary 
Earth Science
A contour (topographic) map indicates that a stream is flowing across a landscape. If the stream has a constant volume, where on the map would the stream most likely have the highest velocity? a. As the stream moves across several closely spaced contour
asked by Paula 
science
which component of the technological system is achieved when your camera takes a photograph ? a) input b) feedback c) goal d) constraint
asked by victoria 
physics
Given the forces Fa= 2.3 N [S 35° W], Fb= 3.6N [N 14° W] and Fc= 4.2N [S 24°E] calculate the following: Fa + Fb + Fc
asked by keisha 
social studies
daydreaming can be an expression of: A) repression B) denial C) sublimation D) projection My answer is D
asked by Dee 
physics
A large boulder is ejected vertically upward from a volcano with an initial speed of 39.0m/s . Air resistance may be ignored. (a) At what time after being ejected is the boulder moving at a speed 19.0m/s upward? (b) At what time is it moving at a speed
asked by Emma 
English
really need help on this question it is worth 5 marks. The question is: Explain how "A Thankless Experience" is a satire with support with direct reference to the essay. The short essay is called A Thankless Experience by Stephen Lautens' it is on the
asked by Andy 
Math
How would you solve these compound inequalities? 1. 5k9 2. 1/2z+3=1/5 3. 2
asked by Sam 
math
3. For the following, state the domain, range, and state whether the relation is a function. If it is not a function explain why. {(3,2), (4,5), (8,5), (3,2)} {(4,5), (2,3), (2,4), (9,3)} {3,2), (5,10), (20, 4), (3, 8)} .
asked by jarron 
Physics
A cyclist maintains a constant velocity of 5.2 m/s headed away from point A. At some initial time, the cyclist is 251 m from point A. What will be his displacement from his starting position after 85 s? Answer in units of m What will be his position from
asked by Monica 
Geometry
Which is the best approximation of the volume of the ball of string? A. 300ft^3 B. 600ft^3 C. 1,200ft^3 D. 2,400ft^3
asked by George 
Geometry
Two similar pyramids have laterl area 8ft^2 and 18ft^2. The volume of the smaller pyramid is 32ft^3. Find the volume of the larger pyramid.
asked by George 
uncertainty principle
an electron inside spherical metallic particle of volume 10^ 12 metre cube has a kinetic energy about 10 eV. use uncertainty relations to find relative uncertainty in electron velocity .
asked by ...... 
Math Probabilities
A standard deck of cards contains 52 cards. Of these cards there are 13 of each type of suit (hearts, spades, clubs, diamonds) and 4 of each type of rank (A – K). Two cards are pulled in order from this deck of 52 playing cards. What is the probability
asked by Alex 
Math
A standard deck of cards contains 52 cards. Of these cards there are 13 of each type of suit (hearts, spades, clubs, diamonds) and 4 of each type of rank (A – K). Three cards are pulled in order from this deck of 52 playing cards. What is the probability
asked by Alex 
chemistry again
how do you find the concentration of an ion remaining after a reaction is complete???
asked by Anonymous 
chemistry
What volume of 0.140 M HCl is needed to neutralize 2.53g of Mg(OH)_2
asked by Em 
Chem Simple question
Magnesium metal burns in oxygen to form magnesium oxide, MgO. (a) Write a balanced equation for the reaction Why is it 2Mg+O2>2MgO and not Mg+O>MgO
asked by Julie 
math help
5x+10y +15z15x+10y5z+5x10y5z / (5x+10y+15z)(15x+10y5z)+(5x10y5z) a. 1/3 b. 1 c. x+2y+z / x2y+3z d. x2yz / x+2y3z e. x2yz / x+2y+z my answer is none of above, is  1/3, I didn't know I done it wrong or the question is not correct
asked by Tomas 
AP Chemistry
Carbon monoxide reacts with oxygen to form carbon dioxide by the following reaction: 2CO(g) + O2(g) > 2CO2(g) change in H for this reaction is −135.28 kcal. If 811.7 kcal is released, how many moles of CO must have reacted? 1. 16.3 mol 2. 40.5 mol 3.
asked by Anonymous 
math
1,1/3,1/5,1/7, meaning the next number is 1/9 right?
asked by sam 
Math
How would you use a number line to round 148 to the nearest ten.Explain.
asked by Jerry 
Chemistry
A 50mL solution of NaOH is neutralized by adding 37.5 mL of 0.045 M HCL. What was the original concentration of the NaOH solution?
asked by Julie 
Chemistry
A .500g unknown sample is titrated with 40mL of .187M KMno4 by the following reaction: 5Fe{2+} + MnO4{1} + 8H{+1} > 5Fe{3+} + Mn{2+} + 4H2O. What is the percentage of iron in the following sample
asked by Julie 
7th Grade Math
Simplify Exponents ba*(2ba4)3
asked by Millicent 
Live Tutors
Is there a website that has live tutors for free? Not like tutor. com when you have to sign up with a credit card for a trial.
asked by Kelsi 
orchestra
I will take up a free WordPress site around the WordPress blogs web site (not rellay my own site) but I don't just like the designs they feature. Am i able to start using a acquired design on there? I know of a few Hubpages put websites with different
asked by vhijXWJ8sMNh 
science
you calculate the area of a 150 m x 100.0 m room. How many significance figures should your answer include ? a) 1 b) 2 c) 3 d) 4
asked by victoria 
French
I need to replace the verbs with on. i need help please. ex: Les gens admirent es belles couleurs du Paradisier. ex: On admire les belles couleurs du paradisier. 1)C'est vrai que les gens ont tres peur des araignees, surtout de la veuve noire. 2)D'ou vient
asked by Person 
science
you calculate the area of a 150 m x 100.0 m room. How many significance figures should your answer include ? a) 1 b) 2 c) 3 d) 4
asked by victoria 
chem
how many mL of .135M Sr(OH)2 are needed to neutralize 35ml of .157M HCL I know the answer came out to 20.4 ml My only question is how do I convert HCL to Sr(OH)2
asked by Alexandra 
Chemistry
How many potassium atoms in 7.50g of potassium chromate?
asked by Madison 
Chemistry
Calculate the number of phosphorus atoms in 17.0g sample of calcium phosphate
asked by Madison 
physics
(time given is the total time in the air, up and down) During a baseball game, a batter hits a high popup. If the ball remains in the air for 4.84 s, how high does it rise? The acceleration of gravity is 9.8 m/s2 . Answer in units of m
asked by mary 
social studies
people in countries with tend to be happier A) high incomes B) low incomes C) more civil liberties D) high incomes and more civil liberties My answer is B.
asked by Dee 
math
what is the expression for the factored form of 1/4y^236? I got (1/4y6)(1/4y+6) Is this correct? Thanks for checking my work
asked by B8 
ecology
how do you construct a age pyramid. i have the age class and observed individuals how do i get the present in each age class
asked by donna 
Chem
A 4.96L sample of chlorine gas is contained in a poison control vessel at STP. Calculate the number of grams in this sample
asked by Joe 
Chem
Calculate the massif 3.76x10^20 molecules of tricarbon disulphide. Determine the volume,at STP, of 10.24mol helium gas.
asked by Joe 
Chemistry
Some bacteria get their energy from reduction of CO2 to CH4 by H2. 1. How many electrons are required to reduce CO2 to CH4? 2. Calculate the G for formation of methane based on the two standard reduction potential of 0.171V for reduction of CO2 to CH4 and
asked by Kim 
math subtracting mixed numbers
9 and 3/4 minus 4 and 1/3 =
asked by Tsiyon 
Chemistry
Diarsenic trioxide is the number one source of arsenic; determine the mass of a sample of this extremely poisonous material containing 4.03x10^18 molecules.
asked by Tired 
math
what is the expression for factorization of 6x^2+24? I got 6(x+2)(x2) Hopefully I got this correct. Thanks for checking for me, I appreciate it.
asked by B8 
Math
Ms. Santiago has many pens in her desk drawer. She says that if you divide the total number of pens by 1, 2, 3, 4, 5, or 6, you get a remainder of 1. What is the least number of pens that could be in ms. Santiago's drawer,
asked by Shohanur 
math
how do you solve this problem (m5)^4+36=13(m5)^2 algebraically
asked by maritza 
English/ Writing
What are some bad compound concepts and what makes them bad?
asked by Nick 
Stats/ Probability
Repeated die toss experiment. A fair die is tossed repeatedly, and the sequence of numbers that turn up is recorded, until a 1 is obtained. When a 1 is obtained, the experiment is over, but the 1 is included in the sequence. Thus every outcome is a
asked by denim 
Math
How do you Draw and label 2 different rectangles each with a perimeter of 124 units
asked by Nucole 
Chemistry
The extracellular concentrations of Na+ and K+ are 135mM and 6mM, respectively. The intracellular concentrations of Na+ and K+ are 10mM and 105mM, respectively. The membrane potential is 75mV. For Na+/K+ ATPase, 3Na+ are exported and 2K+ are imported.
asked by Kam 
US history
What were conditions like for the workers befor the beginging of the labor movment?
asked by Mandy Collins 
Math
How would you find the domain and range of x=2^y?
asked by O. 
math one last question
factor completely 4nn^3 n(yn^2) n(2+n)(2n) was this done correctly? Thanks
asked by B8 
chemistry
How many mL of 0.416 M of HCl are needed to dissolve 8.68 g of BaCO3? 2HCl(aq)+BaCO3(s)=BaCl2(aq)+H2O(l)+CO2(g)
asked by christa 
Chemistry
K2SO4+ Na2HPO4=? NaHCO3 + Sr(NO3)2=?
asked by kelly 
Math
How would you solve these compound inequalities? 1. 1
asked by Kimmy 
maths
An initialvalue problem is given by the differential equation, f(x,y) = x + y, y(0) = 1.64 The Eulermidpoint method is used to find an approximate value to y(0.1) with a step size of h = 0.1. Then use the integrating factor method, to find the exact
asked by Matthew 
English Question
What is the difference between though and although?
asked by Anonymous 
math
1. Thomas wants to lose weight for the summer. He currently weighs 245 pounds. He wants to lose 5 pounds a month. What is the linear equation that describes is weight loss? If it is September, how much weight will Thomas lose by July (July not included)?
asked by jarron 
mitx
Consider a flat plate in a supersonic flow at an angle of attack as shown in the figure above, and assume the flow is inviscid. We will learn later in the course that the resulting flow is such that the pressure is uniform on both the upper surface and
asked by Anonymous 
Trig
2x^2+2x>4
asked by Kiki 
Physics 2
A 3.0g string, 0.14 m long, is under tension. The string produces a 200Hz tone when it vibrates in the third harmonic. The speed of sound in air is 344 m/s. Find the tension in the string.
asked by Heather 
Science
I need help with finding a picture that goes with Newton's first, second,and third law of motion
asked by Anonymous 
Math
How would you solve these compound inequalities word problems? 1. The human ear can distinguish sounds between 20Hz and 20,000 Hz, inclusive. 2. For a man to box as a welterweight, he must weigh more than 140 lbs, but at most 147 lbs.
asked by Pam 
life science , geography , history and math literecy
I am a grade 11 student and want to follow careers linked to geograpy . My problem is that most of the careers I am in interested in want pure math and im doing math literecy . My question is that , Is it possible for me to start mathematics in University
asked by felicia 
Pre Calculus
He needs two adjacent rectangular enclosures  he has 300 feet of fencing. a. find a function that models the total area of enclosures with respect to the width of the enclosures. b. write your function in vertex form using the vertex formula. c. what is
asked by emily 
MATH
customers loan of 675 the annual interest is 19.25. what is the total dollar amount to be repaid including principle and interest for the entire year?
asked by Anonymous 
Science
Can someone please send me a picture explination of Newton's third law and about a paragraph explaining how it works and stuff thank you .
asked by Bs 
Chemistry
The extracellular concentrations of Na+ and K+ are 135mM and 6mM, respectively. The intracellular concentrations of Na+ and K+ are 10mM and 105mM, respectively. The membrane potential is 75mV. For Na+/K+ ATPase, 3Na+ are exported and 2K+ are imported.
asked by Drew 
college physics
An object acted on by three forces moves with constant velocity. One force acting on the object is in the positive x direction and has a magnitude of 6.4N ; a second force has a magnitude of 5.0N and points in the negative y direction.
asked by taylor 
Math
Solve the system by substitution or elimination. x^2 + 2y^2 = 8 x^2  y^2 = 1
asked by S 
math
amount of matter in an object
asked by neil 
Physics
A 2.86 kg block starts from rest at the top of a 27.5◦ incline and slides 1.94 m down the incline in 1.43 s. The acceleration of gravity is 9.8 m/s2. What is the speed of the block after it slid the1.94 m? Answer in units of m/s
asked by Anthony 
physics
a body is under of 2 forces 7n and 10n find the resultant of 2 forces if (a)the forces are parallel and act in thesame direction (b)the forces are parallel and act in opposite direction(c)the two forces are inclined and act at an angle of 60 degree to each
asked by johnson 
physics
a body is under of 2 forces 7n and 10n find the resultant of 2 forces if (a)the forces are parallel and act in thesame direction (b)the forces are parallel and act in opposite direction(c)the two forces are inclined and act at an angle of 60 degree to each
asked by johnson 
math
2. Susan has a bank account in Bank of America. She takes out 600 dollars a month for rent. 3 month later, she has $3,200. What is the linear equation that describes Susan’s situation? How much did Susan start with in her bank account? How many months
asked by jarron 
Science
picture of Newton's second law of motion and explanation or description also an explanation of inertia
asked by Yb 
law
can someone please help me to understand what I am looking for to answer this question and where to find the information. examine how criminal justice responses to crime may be shaped by these theories (DifferentialAssociation and the Rational Choice).
asked by Patiance 
physics
A pilot flying low and slow drops a weight; it takes 3.2s to hit the ground, during which it travels a horizontal distance of 155m . Now the pilot does a run at the same height but twice the speed. How much time does it take the weight to hit the ground?
asked by jay 
chemredox
Ca + Cr2O7{2} = Ca{2+} + Cr{+3} Blance the redox please someone help me I got exam tomorrow and I got to go sleep soon
asked by Please help 
ALGEBRA 2 help please would appreciate
3x8 over 3x subtract 8 over 7y please show all work help needed. I have no idea how to do it
asked by lisa 
math
why is every integer a rational number?
asked by jess 
Math (College PreCal)
The exact conversion between the English measurement system and the metric system is given by the equation 1 inch= 2.54 cm. Let f(x) be the number of miles in x meters. Find a formula for f(x). Give an exact answer.
asked by anonymous 
chemistry
Calculate the magnitude of the cohesive energy of potassium iodide (KI). The ionic radii of K+ and I−, are 152 pm and 206 pm, respectively. Assume the Born exponent n is 10. Assume a Madelung constant of 1.7. Please report your answer in kJ/mol or how to
asked by simone 
Genetics 160
Using D for tall plants and d for dwarf plants, a 1:1 ratio is obtained in which of the following crosses? These are my choices: Dd X dd DD X dd DD X Dd DD X DD Dd X Dd
asked by Julie 
science
convert following measurement 23kL= L
asked by addi 
Physics
Vector has a magnitude of 8.10 units and makes an angle of 52.0° with the positive xaxis. Vector also has a magnitude of 8.00 units and is directed along the negative xaxis. Using graphical methods find the following. a) The vector sum Magnitude of A +
asked by Griet 
Geometry
The density of steel is about 0.28Ib/in^3. could you lift a solid steel ball with radius 4in? whith radius 6in? explain
asked by George 
Need to know how to do it, not just answer
Post a behavioral research situation that could use a Pearson coefficient research study and a chi square research study. Present the rationale for each selection. Be very specific in your presentation
asked by Question on practice exam 
Genetics
Albinism is inherited as a simple recessive trait. If a woman and her husband are both heterozygous for albinism then what is the probability that their first five children will have these phenotypes? Child 1  albino; child 2  normal; child 3  normal;
asked by Hannah 
englsih
what is writing conventions and how do i improve min
asked by w 
PHYSICS
HOW TO SOLVE A CIRCUIT CONTAINING A CAPACITOR ACROSS A RESISTOR?
asked by J.NANDHINI 
physic
As you look out of your dorm window, a flower pot suddenly falls past. The pot is visible for a time t, and the vertical length of your window is Lw. Take down to be the positive direction, so that downward velocities are positive and the acceleration due
asked by koler 
stats
Post a behavioral research situation that could use a Pearson coefficient research study and a chi square research study. Present the rationale for each selection.
asked by high school 
physic
You are traveling at a constant speed υM, and there is a car in front of you traveling with a speed υA You notice that υM>υA, so you start slowing down with a constant acceleration a when the distance between you and the other car is x. What
asked by kolam 
Chemistry
You have three solutions, A, B, and C, each of which are believed to be one of the following: calcium hydroxide, potassium sulfate, and sodium chloride. Combining B and C results in the formation of a precipitate, but neither solution forms a precipitate
asked by Matt 
Algebra
Two persons, A and B, together have $6 less than a third person, C. If B gives $5 to A, then A will have half as much money as c does. If A gives $5 to B, then A will have one third of what c has. How many dollars has each?
asked by Jane 
statistics,math
Post a behavioral research situation that could use a Pearson coefficient research study and a chi square research study. Present the rationale for each selection. Be very specific in your presentation
asked by high school 
Chemitry
if your smoke detector contains 0.10 mg of 241Am, how long will it take to decay 1.25 * 10^2mg
asked by Mel 
Geometry
find the radius of a sphere withh the given property. A.The number of square meters of a surface area equals the number of cubic meters of volume. B. The ratio of surface area in square meters to volume in cubic meters is 1:5.
asked by George 
Physical Conceptual Science
Trucks often have signs on the back that say, “If you can’t see my mirrors, I can’t see you.” Explain the physics.
asked by Miss Angie 
Chemistry
Saccharin (C7H5NO3S) is sometimes dispensed in tablet form. Ten tablets with total mass of 0.5860 g were dissolved in water. They were oxidized to convert all the sulfur to sulfate ion, which was precipitated by adding an excess of barium chloride
asked by chica 
Geometry
what is the radius of the ball of string to the nearest tenth of a foot? A. 3.3 B. 6.6 C. 13.2 D. 20.75
asked by George 
SS
The political movement that brought Africans together in the 1950s was known as ________. a. imperialism b. salt trade c. colonialism d. PanAfricanism Enslaved Africans from West Africa traveled across the Atlantic Ocean to European Colonies in the
asked by A 
physics
A tennis player kits a ball at ground level giving it initial velocity of 22.0 m/s at 58 degrees above the horizontal. Any help would be appreciated. Thanks.
asked by deb 
Algebra 1
You had $22 to spend on four raffle tickets. After buying them you had $6. How much did each raffle ticket cost?
asked by Brendan 
Algebra
Consider two points A=(2,5) and B=(4,3), and a third point P=(a,b) on the xaxis. If the minimum value of line PA^2+ line PB^2 is c, what is a+b+c?
asked by Ruth 
Geometry
The slan heights of two similar pyramids are in the ratio 1:5. The volume of the smaller pyramid is 60m^3. What is the volume in cubic meters of the larger pyramid?
asked by George 
Geometry
A lawn chair weighs 8Ib. A child's lawn chair has dimensions exactly one half those of the larger chair. How many pounds does the child's chair weigh?
asked by George 
maths
Ramesh buys 150 shares of par value ` 10/ each of a company which pays annual dividend of 15% at such a price that he receives 10% on his investments. What is the market value of share?
asked by partha 
maths
At what rate of interest per annum, the amount ` 10, 000/ will be doubled in 5 years, interest being compounded quarterly?
asked by partha 
Geometry
The volume of two similar rectangular prisms are 64cm^3 and 1000cm^3. The surface area of the smaller figure is 112cm^2. What is the surface area in square centimeters of the larger figure?
asked by George 
science
What is then volume in mL of then solution 3.04g of sodium chloride from a 0.110 M solution?
asked by samantha 
maths
In a family of two children, find the probability that the family has two boys given that the first child is a boy.
asked by partha 
chemistry
What mass of KCl \rm KCl is needed to precipitate the silver ions from 13.0mL mL of 0.200 M M AgNO 3 \rm AgNO_3 solution
asked by Anonymous 
Geometry
Find the missing length. MG=10cm, NP=4cm, QP= 14cm, MN=____cm
asked by George 
maths
How much does it cost to paint a triangular surface of sides 6 m, 5 m and 11 m at the rate of ` 20/ per 2 m ?
asked by partha 
Chemistry
Saccharin (C7H5NO3S) is sometimes dispensed in tablet form. Ten tablets with total mass of 0.5800 g were dissolved in water. They were oxidized to convert all the sulfur to sulfate ion, which was precipitated by adding an excess of barium chloride
asked by Anonymous 
maths
Two cones with same base radius 4 cm and height 8 cm are joined together along their bases. Find the surface area of the shape so formed.
asked by partha 
physics
Q1) consider a stationary nucleus of mass M. show that the minimum energy the photon must have to create an electronpositron pair in the presence of stationary nucleus is 2mc^2(1+ m/M) where m is the rest mass of the electron.
asked by ...... 
physics
(time given is the total time in the air, up and down) During a baseball game, a batter hits a high popup. If the ball remains in the air for 4.84 s, how high does it rise? The acceleration of gravity is 9.8 m/s2 . Answer in units of m
asked by mary 
8th grade science
How does altitude affect the freezing, melting and boiling points of water?
asked by A 
Probability and Statistics
Assume 10% of the engines manufactured on an assembly line are defective. If engines are randomly selected one at a time and tested. What is the probability that the third nondefective engine will be found a)on the fifth trial? b) on or before the fifth
asked by Katy 
Chemistry
Calculate the molarity of a solution prepared by dissolving 16 g of urea, NH2CONH2, in 39 g of H2O. The density of the solution is 1.3 g/mL. I've tried this question so many times but I keep getting it wrong please help me
asked by danielle 
Probability Math
Event A has probability of 0.2 and event B has probability of 0.3. If they are independent, what is the probability that both of them happen? I can't remember how to do this one.
asked by Alex 
chemistry
44.0 mL \rm mL of 0.150 M M Na 2 SO 4 \rm Na_2SO_4 and 25.0 mL \rm mL of 0.160 M M KCl M Na + M_{\rm Na^+}, M SO 4 2− M_{\rm {SO_4}^{2}}, M K + M_{\rm K^+}, M Cl − =????
asked by Anonymous 
Math
There are 45 candies in a bowl, 20 red and 25 yellow. If two are taken from the bowl, what is the probability they will be two red candies? here is what I have but I need help with the rest or even knowing if I am right. 20/45 25/43 25 * 20 = 500 45 * 43 =
asked by Alex 
more chemistry
What volume of 0.115 M M HClO 4 \rm HClO_4 solution is needed to neutralize 58.00mL mL of 8.75×10−2 M M NaOH \rm NaOH
asked by Anonymous 
math
cellular phone companies. 1. with this plan each person is charged $19.95 per month and $0.31 per minute 2. with this plan each person is charged $40.95 per month and $0.16 per min 3. with this plan each person is charged $80.95 per month with unlimited
asked by louise 
Math
A pilot of a single engine airplane flies at a constant speed of 200 km/h at a bearing of 25 degree north east there is 40 km/h crosswind blowing south east 45 degree what are plane's actual speed and direction ?
asked by Vian 
Advance mathematics
How can i find semiinterquartile range from grouped data?
asked by Angelus 
physics
(time given is the total time in the air, up and down) During a baseball game, a batter hits a high popup. If the ball remains in the air for 4.84 s, how high does it rise? The acceleration of gravity is 9.8 m/s2 . Answer in units of m
asked by mary 
Cengage learning
a year ago Green Technologies Growth Funds was being quoted at an Nav of $21.50
asked by Anonymous 
Maths
An initialvalue problem is given by the differential equation, f(x,y) = –20xy2, y(1) = 1. Use the classical fourthorder RungeKutta method with a stepsize of h = 0.02, to obtain the approximate value of y(1.02). Give your answer to 6 decimal places.
asked by Nancy 
Combinatorics
Calvin has 3 red juggling pins, 4 blue juggling pins, 5 white juggling pins, and 6 green juggling pins. How many ways can he give a set of 3 juggling pins to Dan?
asked by John 
chemistry
Concentrated sulfuric acid (18.3 M) has a density of 1.84 g/mL. How many moles of H2SO4 are in each milliliter of solution?
asked by Anonymous 
Calculus
A function of three variables is given by, f (x,y,t) = x3y2sin t + 4x2t + 5yt2 + 4xycos t Find ft (3.44,0.58,8.1) giving your answer to 3 decimal places. anybody please help me... thanks a million... got stuck with this qns..
asked by Fox 
Chemistry
Some bacteria get their energy from reduction of CO2 to CH4 by H2. 1. How many electrons are required to reduce CO2 to CH4? 2. Calculate the G for formation of methane based on the two standard reduction potential of 0.171V for reduction of CO2 to CH4 and
asked by Kam 
algebra
trying to solve a point a slope word problem. you are scheduled to start your job at an oil change shop 2 hours after shop opens. two hours after you start, a total of 11 cars have had their oil changed. three hours later, a total of 14 cars have had their
asked by aaron 
Physics
what is the relationship between forces in equilibrium and their components?
asked by Riana 
Physics
Problem 2 A car is stopped at a traffic light. It then travels along a straight road so that its position from the light is given by x(t) 2.5t  0.13t^2 in meters. c. What is the position of the particle when it reverses its motion?
asked by Maryam 
Chemistry
CuSO4+LiNo3 Potassium sulfate+lithium nitrate Can someone help me figure out the equations for these two? Phases aren't required
asked by kelly 
Physics
Problem 4 Speedy car, driving at 30 m/s. The driver suddenly observes a slowmoving van 155 m ahead traveling at 5 m/s in the same direction. The driver of the car immediately applies the brakes causing a constant acceleration of 2 m/s2 in a direction
asked by Maryam 
math help
(2np.3r/4r)(2np3n)=? a. 1/2np+3n b. 1/2np3n c. np/2r+3n d. 1/2np+3n e. 1/2np3n Please answer and explan
asked by Tomas 
psy 331
Wilhelm Wundt is known for his research relating to introspection. During the use of this technique, participants receive: (Points : 1) subliminal messages from the researcher and are asked if they remember the messages. a stimulus from the researcher and
asked by hah 
Math
state and prove the distributive property of rational numbers.
asked by John 
philosophy logic  math
Natural Deduction Proof 1. 1 ~Y ⇒ ~L 2 W v ~Y 3 W ⇒ ~B / ~B v ~L 2. 1 ~U • (G = ~T) 2 (~U v D) ⇒ (W • ~R) / W • ~U 3. 1 (M ⇒ P) ⇒ ~P 2 H ⇒ P 3 M ⇒ H / ~H 4. 1 ~Z 2 S 3 Zv(S ⇒ H) / H
asked by Rick 
Social Studies
Which of the following describes the economies of Ghana and the Democratic Republic of the Congo (DRC)? a. Ghana has a stable, fastgrowing economy while DRC has an unstable economy due to internal conflict. b. The economies of both Ghana and DRC are
asked by Anonymous 
Math
Prove that (xt+yr)/yt is already in lowest terms, b and d have no common prime factor. Note that x/y and r/t are fractions in reduced terms.
asked by John 
Math
Finding the critical value(s) of x^2, and use a x^2 distribution table to find the limits containing the Pvalue. Determine whether there is sufficient evidence to support the given alternative hypothesis. Test Ho:theta=2.63,Versus H1:theta does not
asked by Cheryl 
music
what is a piece of music that i can research it in depth?
asked by sindey 
physics
an electron inside spherical metallic particle of volume 10^ 12 metre cube has a kinetic energy about 10 eV. use uncertainty relations to find relative uncertainty in electron velocity
asked by prerana 
physics
consider a stationary nucleus of mass M. show that the minimum energy the photon must have to create an electronpositron pair in the presence of stationary nucleus is 2mc^2(1+ m/M) where m is the rest mass of the electron.
asked by prerana 
ap chem
What volume of 0.140 M HCl is needed to neutralize 2.53g of Mg(OH)
asked by ally 
ap chem
If 26.0mL of AgNO 3 is needed to precipitate all the Cl −ions in a 0.750mg sample of KCl (forming AgCl), what is the molarity of the AgNO 3 solution
asked by ally 
PHYSICS
Two protons in a molecule are 3.80 multiplied by 1010 m apart. Find the electrical force exerted by one proton on the other. Magnitude N (b) State how the magnitude of this force compares with the magnitude of the gravitational force exerted by one proton
asked by physics 
Chem simple question
how many mL of .135M Sr(OH)2 are needed to neutralize 35ml of .157M HCL I know the answer came out to 20.4 ml My only question is how do I convert HCL to Sr(OH)2
asked by Julie 
History
Which of the following statements about John D. Rockefeller is most accurate? A. He founded the Standard Oil Company when he was 24 years old. B. He considered competition to be the central ideal of capitalism. C. He drilled the first oil well near
asked by carolyn 
HELP PLZ
what is a project proposal?
asked by Mary Ann 
math
light from the sun takes approximately 8 minutes to reach earth. If the light travels at a speed of 3 x 10 raised to 8 meters / second, calculate to 3 significant figures the distance from the sun to the earth
asked by chetan 
geometry
if line MS is a median of triangle MNQ. Line QS equals 3a14, line SN equals 2a + 1, and the measurment of angle MSQ equals 7a+1, find the value of a. Is line MS also an altitude of triangle MNQ?
asked by steve 
8th grade Science
In the early 1900s, Alfred Wegener noticed that some of the Earth's continents looked like they might fit together like a jigsaw puzzle. He also observed that the continents that looked like they fit together had similar plants, animals, and rock
asked by M 
Mathmatics
A function of two variables is given by, f(x,y) = e^2x3y Find the tangent approximation to f(0.989,1.166) near (0,0), giving your answer to 4 decimal places. Any kind soul to help on the problem. My professor raise this problem to me. i am so stuck.
asked by Margaret 
Mergers & Acquisitions
List the three ways that tender offer legislation protects target company shareholders?
asked by misvirg 
Chemistry
Determine if precipitation occurs and write the proper ionic equation a) Na2O3+NiCL2 b) Pb(NO3)2+ALCL3
asked by Julie 
Wayne community college
When a 0.101 kg mass is suspended at rest from a certain spring, the spring stretches 3.80 cm. Find the instantaneous acceleration of the mass when it is raised 5.90 cm, compressing the spring 2.10 cm.
asked by Joe 
Math Probabilities
P(A or B) = P(A) + P(B) − P(A and B) when 1. A and B are mutually exclusive 2. A and B are complements 3. A and B occur together 4. A and B are dependent I am pretty confused on this one help will be great :)
asked by Alex 
Basic Biomechanics
Wendell invests $10,000 in a stock portfolio made up of Petroleum Special at $30 per share, New shoes at $12 per share, and Capital beans and Sprouts at $2.50 per share. He places 60 percent of the money in P.S., 30 percent in N, and 10 percent in B & S.
asked by Walter 
Basic Biomechanics
John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John?
asked by Walter 
Basic Biomechanics
A sailboat heads north at 3 m/s for 1 hour and then tacks back to the southwest (at 45 degree to north) at 2 m/s for 45 minutes. a. How far has the boat sailed? b. How far is it from its starting location?
asked by Walter 
Biology
Glucose + Fructose=__________________. I am thinking it is sucrose or table sugar but I am not sure.
asked by David 
math
A store has 2 times as many hooded sweatshirt as crewneck sweatshirt. The total number of sweatshirts is 36. How many hooded sweatshirts does the store have?
asked by Ms.Vargas 
Chemistry
How many atoms of hydrogen are in a mixture of 3.49x10^23 molecules of H2O and 78.1g of CH3OH?
asked by Madison 
Algebra HELP!!
Find the measure of each angle. Angle A is half as large as its complement angle B
asked by J 
Algebra 1
Solve the equation. 4x + 2 = 5(x + 10)
asked by Anonymous 
world history
what was the most significant reform that Peter the Great implemented in Russia?
asked by Anonymous 
algebra
Kelly plans to put her graduation money into an account and leave it there for 4 years while she goes to college. She receives $750 in graduation money that she puts it into an account that earns 4.25% interest compounded semiannually. How much will be in
asked by joe 
social studies
all personality variables are: A) highly heritable B) unconscious C) theoretical constructs D) easily assessed with questionnaries My asnwer is D
asked by Dee 
criminal Justice
Please help me figure out what I am searching for in this question. •Discuss your first theory(Rational Theory) and how criminal justice responses may be formed based on the assumptions of this theory.
asked by Tom 
Engineering
What is the critical buckling force that will buckle a 9 foot tall 2 x 4 (K = 1.0)? Please show how to set up the problem and the steps to solve. I do not understand. Thank you.
asked by Nabil 
math
y = ½ x^2 – x +3 for 0≤x≤6 (b) Calculate the mid ordinates for 5 strips between x = 1 and x= 6, and hence use the midordinate rule to approximate the area under the curve between x = 1, x = 6 and the x = axis. (c) assuming that the area determined
asked by kg 
Math
So im told to find the value of each variable. It's a X. One side equals 3xº and the other side says (80x)º 3x=80x 4x=80 x=20 As you can see the value I got was 20. But in another question it tells me to find the measure of the labeled angles. How do I
asked by J 
chemistry
how many millimeters of a 5.15 M CH3OH stock solution are needed to prepare 375 mL of a solution having 7.50 mg of methanol per mL of solution
asked by Anonymous 
Algebra 1
Solve the equation. 3(t + 7) + 2 = 6t  2 + 2t
asked by Anonymous 
Math
Draw all the possible rectangles with a perimeter of 26 cm and whole number lengths of sides. For each rectangle, label the lengths of two adjacent sides
asked by Molly 
Science/Math
Word Problem page 19 John and Al are in a 15 km race. John averages 4.4 m/s during the first half of the race and then runs at a speed of 4.2 m/s until the last 200 m, which he covers at 4.5 m/s. At what average speed must Al run to beat John? The textbook
asked by Walter 
Science/Math
Math Problem page 18 Wendell invests $10,000 in a stock portfolio made up of Petroleum Special at $30 per share, Newshoe at $12 per share, and Beans and Sprouts at $2.50 per share. He places 60 percent of the money in P.S. (Petroleum Special), 30 percent
asked by Walter 
Physics
A student throws a baseball at a large gong 45 m away and hears the sound of the gong 1.35258 s later. The speed of sound in air is 330 m/s.What was the average speed of the base ball on its way to the gong? (For simplicity, assume its trajectory to be a
asked by Tristan 
Statistics
1. In a certain game, the probability of getting a red outcome is 0.03. Find the probability of getting an outcome that is not red? The answer must be in a decimal. I put 0.97 as the answer ( 10.03=0.97) 2. The instructor in a Humanities class says that
asked by Lisa 
Pre Algebra
208/1000=x/125 How do you solve it or can you
asked by Daniel 
math
factor completely n^4y^4 (n^2+Y^2)(n^2y^2) (n^2+y^2)(n+y)(ny) Did I do this correctly? Thank you
asked by B8 
Math/physics
An 6 x 8 wood column is 17 feet tall and is loaded with 40 Kips. Will it buckle (K = 1.0)? How do I set this up and solve? Please show steps. I am confused and do not know how to start. Thank you.
asked by sejul 
Math
What is the inequality sign for the word about? For example, Sally had about 10 apples.
asked by Ally 
math
1,0,1,1,01,1,1,0,1,1,1,101, meaning the next numbers are 1,01, right?
asked by sam 
physics
an airplane rolls down the runaway. compared to which reference point is the airplane in motion?
asked by Anonymous 
english
animals posses sensory powers that humans lack. Homing pigeons fly with great speed and accuracy when with messages to faraway places
asked by Anonymous